Now, to cyber monday mania. Retailers, chalking up their biggest online shopping day in history. A number made on smartphones and tablets. Rebecca jarvis is here. Who shopped online yesterday? Guilty. A record-shattering 131 million americans filling their carts. Shoppi iping cyber monday. They spent $2 billion online. Sales soaring 20% versus last year. And the biggest trend is going mobile. More than of than ever, one-third of everyone who shopped did it from their smartphone or tablet. At walmart, more than half of the cyber monday sales came from mobile devices. 55%. And a lot of the shopping came from referrals on facebook and pinterest. People saw what their friends were doing, and they bought it. What was the top seller? Reporter: We're all buying tablets from our tablets. The biggest seller at amazon was the kindle. That was the number one selling item. The samsung galaxy tablet and apple's ipad and ipad minis dominated purchases. The world is changing. It's gone mobile. Thanks, rebecca, very much.

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